Syringe propelling gun



SYRINGE PROPELLING GUN Jack A. Crockford, Chamblee, Frank A. Hayes, Seldon D. F eurt, and James H. Jenkins, Athens, and Harold C. Palmer, Atlanta, Ga., assignors to Palmer Chemical and Equipment Co., Inc., Atlanta, 8a., a corporation of Georgia Filed June 19, 1959, Ser. No. 821,495

Claims. (Cl. 124-30) This invention relates to a syringe propelling gun which is particularly applicable to situations where the gun is a pistol and space for the operation of the bolt is at a premium.

Guns of this type have become most useful since the invention of a practical syringe projectile which has been disclosed in a number of applications and in issued patents.

Where the gun is in the form of a pistol (which finds great use in dog catching and in zoo operations) the size of the syringe to be propelled may be almost half the length of the barrel of the pistol. Therefore, if the conventional pistol is used for this purpose the boltmust be moved a distance corresponding to the length of the syringe. However, if this is done then the length of the pistol is correspondingly increased and the device becomes too bulky for proper use.

The instant invention avoids the above difliculties by providing for a pivotally movable bolt which, after being withdrawn from the barrel, is swung about the barrel so as to expose the rear thereof for insertion of a syringe. After the syringe is inserted the bolt is brought into horizontal alignment with the rear of the barrel and thence moved longitudinally into the barrel to place the gun in firing condition. It can thus be seen that the length of the pistol is not increased regardless of the size of syringe used.

The instant invention can be briefly described as an improvement to a syringe propelling gun which has a frame and a barrel upon the frame open at both ends thereof. The improvement itself comprises a bolt support which is pivotally secured adjacent the rear of the barrel and is normally in horizontally aligned relationship with the barrel. A bolt is slidably movable within the bolt support when the bolt support is in such horizontally aligned relationship. The bolt is also insertable and removable from the barrel in such relationship. However, when the bolt is withdrawn from the barrel the bolt and bolt support are pivotally movable about the barrel so as to expose the rear of the barrel and permit insert-ion of a syringe therewithin.

In the preferred modification of the invention a push rod is carried by the front of the bolt so as to insure proper seating of the syringe in the barrel of the gun. Gas sealing means are also carried by the bolt to insure proper firing of the syringe. Also, in the preferred modification of the invention, the bolt is pivoted to a position substantially perpendicular to the barrel when a syringe is to be inserted therein.

The invention will be further described by reference to the accompanying drawings which are made a part of this specification. However, it is to be understood that the specific modification shown is for illustrative purposes and for purposes of example only. Various changes and modifications may obviously be made within the spirit and scope of the invention.

Fig. 1 is a side view of a gun having the improvements of this invention embodied therein.

2355,94 Patented Jan. 3, 1961 Fig. 2 is a top view of the bolt and bolt support of this invention with the front of the bolt and bolt support not shown.

Fig. 3 is a side view of the bolt and bolt support shown in Fig. 2.

Fig. 4 is a side view of the bolt and bolt support of this invention showing the parts as they appear when a syringe is to be inserted into the barrel.

Fig. 5 is a sectional view of the bolt and bolt support shown in Fig. 2 taken along lines 5-5 of Fig. 2.

Referring now to the drawings for a detailed description of one form of the invention the pistol 11 comprises a frame 12. Pistol 11 is also provided with a cocking mechanism 13, a trigger 14, a safety catch, and sights 16 and 17.

Barrel 18 is disposed upon frame 12 and is open at I the front portion 19 and the rear portion 2i).

Bolt support 21 is pivotally secured to barrel 18 adjacent rear portion 20 by pin 22. Bolt support 21 is provided with a longitudinal slot 23 having a holding portion 24. Bolt 25 is slidably movable within bolt support 21 when bolt support 21 is in normal aligned relationship as shown in Figs. l3.

Handle 26 is disposed within slot 23 and is also formed with projection 27 to permit better holding of the bolt. A push rod 28 is carried by the front of bolt 25. Gas sealing means 29 are also disposed about bolt 25. These gas sealing means are preferably natural or synthetic rubber gaskets.

With the foregoing detailed description the operation of this invention will now be explained.

A syringe (not shown) is prepared for loading into the gun of this invention. Bolt 25 is drawn back to its fullest extent so that push rod 28 is withdrawn from barrel 18. Bolt 25 and bolt support 21 are then pivoted about barrel 13 to the position shown in Fig. 4. The syringe is then inserted into the rear of barrel 1% and pushed into barrel 13 by hand as far as it will go. Bolt 25 and bolt support 21 are then pivoted about barrel 18 to the position shown in Fig. 1. Handle 26 is then grasped and bolt 25 pushed forwardly into barrel 18. This, of course, pushes the syringe into firing position. Handle 26 is then locked into position within holding portion 24 and the gun fired. The operation is then repeated as required.

We claim:

1. In a gas operated syringe propelling gun having a frame and a barrel upon said frame open at both ends thereof the improvement which comprises a bolt support pivotally secured adjacent the rear of said barrel and normally in horizontally aligned relationship therewith, a bolt slidably movable within said bolt support and insertable for a distance into said barrel and withdrawable from said barrel when said bolt support is in normal aligned relationship, said bolt and bolt support being pivotally and upwardly movable about said barrel when said bolt is withdrawn from said barrel so as to expose the rear of said barrel and permit insertion of a syringe therein.

2. In a gas operated syringe propelling gun having a frame and a barrel upon said frame open at both ends thereof the improvement which comprises a bolt support pivotally secured adjacent the rear of said barrel and normally in horizontally aligned relationship therewith, a bolt slidably movable within said bolt support and insertable for a distance into said barrel and withdrawable from said barrel when said bolt support is in normal aligned relationship, a push rod secured to the front portion of said bolt, said bolt, push rod and bolt support being pivotally and upwardly movable aboutsaid barrel when said bolt and push rod are withdrawn from said barrel so as to expose the rear of said barrel and permit insertion of a syringe therewithin.

3. In a compressed gas'operated syringe propelling gun having a frame and a barrel upon said frame open at both ends thereof the improvement which comprises a bolt support pivotally secured adjacent the rear of said barrel and normally in horizontally aligned relation ship therewith, said bolt support being provided with a longitudinal slot therewithin and a holding portion at the front portion of said slot, a bolt slidably movable within said bolt support and insertable for a distance into said barrel and withdrawable from said barrel when said bolt support is in normally aligned relationship, a handle portion upon said bolt disposed within said slot, a push rod secured to the front of said bolt, said bolt, push rod and bolt support being pivotally and upwardly movable about said barrel when said bolt and push rod are withdrawn from said barrel so as to expose the rear of said barrel and permit insertion of a syringe therewithin.

4. In a compressed gas operated syringe propelling gun having a frame and a barrel upon said frame open at both ends thereof the improvement which comprises a bolt support pivotally secured adjacent the rear of said barrel and normally in horizontally aligned relationship therewith, said bolt support being provided with a longitudinal slot therewithin and a holding portion at the front portion of said slot, a bolt slidably movable within said bolt support and insertable for a distance into said barrel and withdrawable from said barrel when said bolt support is in normal aligned relationship, a handle portion upon said bolt disposed within said slot,

gas sealing means upon said bolt, a push rod secured to the front portion of said bolt, said bolt, push rod and bolt support being pivotally and upwardly movable about said barrel when said bolt and push rod are withdrawn from said barrel so as to expose the rear of said bar-rel and permit insertion of a syringe therein.

5. In a compressed gas operated syringe propelling pistol having a frame and a barrel upon said frame open at both ends thereof the improvement which comprises a bolt support pivotally secured adjacent the rear of said barrel and normally in horizontally aligned relationship therewith, said bolt support being provided with a longitudinal slot therewithin and a holding portion at the front of said slot; a bolt slidably movable within said bolt support and insertable for a distance into said barrel and withdrawable from said barrel when said bolt support is in normal aligned relationship, a handle portion upon said bolt disposed within said slot, gas sealing means upon said bolt, a push rod carried by the front of said bolt, said bolt, push rod and bolt support being pivotally and upwardly movable about said barrel to a position substantially perpendicular to said barrel when said bolt and push rod are withdrawn from said barrel so as to expose the rear of said barrel and permit insertion of a syringe therewithin.

References Cited in the file of this patent UNITED STATES PATENTS 79,291 Morgenstern June 23, 1868 1,677,810 Bond July 17, 1928 2,147,185 Ahern Feb. 14, 1939 

